Is there a number a such that a^-1 = a^1? If so, give the value of a.

Find percent notation for 0.008 0.008=

Ineed to know the answer to this algebra question.

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.